Bolt lock



E. HENSEL BOLT LOCK July 8, 1958 Filed March 28, 1954 I In! IYI n w I V9 ,4 5

v INVENTOR EP/cH HENSEL ATTORNEY United States 2,841,974 Patented July8, 1958 BOLT: LOCK Erich Hansel, Doberlng-Kirchhain, Germany ApplicationMarch 23, 1954, Serial N 0. 418,042 2 -Claims.' (Gl; 7 -134) Thisinvention relates to locks,; and more particularly to bolt locks,especially for articlesof furniture or the like.

An object of the invention is toreduce the parts of a lock to a minimum.

Another object ofthe inyentioniistto provide, a lock of a constructionwhich,facilitatesthemounting ofithelock.

A further object of the invention is to provide a lock which may bemanufactured at low costs.

Another object of the invention is to improve on the art of bolt locksas now customarily made.

Other objects and structural details will be apparent from the followingdescription when read in conjunction with the accompanying drawingforming part of this specification, wherein:

Fig. 1 is a horizontal sectional view of a lock according to theinvention mounted on the door of a cabinet,

Fig. 2 is a vertical sectional view of the lock shown in Fig. 1,

Fig. 3 is an elevational view of the sleeve for guiding the key as seenin the direction of the arrow III of Fig. 2,

Fig. 4 is a longitudinal sectional view of the lock with the bolt in anadvanced and secured locking position,

Fig. 5 is a sectional view of the lock taken on line AB of Fig. 4, and

Fig. 6 is a longitudinal sectional view of the lock similar to thatshown in Fig. 4, wherein, however, the bolt is in its retracted positon.

Referring now to the drawings, the lock comprises: the sleeve 1 forguiding the key 8, the cylindrical bolt 3, the sleeve 2, for guiding thebolt 3, the bolt catch 4, the spring 5, acting on the bolt catch 4, andthe sleeve 6 for receiving the bolt 3 in locking position. The rear endof the sleeve 1 made of an artificial material, for example a plastic,by injection molding is provided with semi-circular safeguarding grooves7 which are in accordance with the steps of the ward of the key 8. Thissimple arrangement replacing hitherto customary complicated safeguardingarrangements may be readily carried out in numerous variations by acorresponding shaping of the mold for the sleeve 1. The longitudinalaxis of the sleeve 1 being offset to the longitudinal axis of the sleeve2 extends in a direction perpendicular to the direction of thelongitudinal axis of said sleeve 2.

The cylindrical bolt 3, likewise made of an artificial material, forexample a plastic, has a slot-like recess 9. A bolt catch 4 in the shapeof a double-armed bell-crank lever is inserted into said slot. 9. Whenthe bolt 3 is in its advanced locking position as shown in Fig. 4, aspring 5 acting on the catch 4 urges a nose 10 on the long arm 4' ofsaid catch 4 into engagement with a projection 11 on the casing sleeve2. Thus, the catch 4 acts as safety means for preventing an unauthorizedpushing back of the bolt 3 when the latter is in its advanced position.If it is desired to open the look by retracting the bolt 3, the catch 4is swung out of its locking position by rotating the key 8 and urgingits ward against the short arm 4" of the catch 4, so that, during acontinuation of the rotation of the key 8 the tapered surfaces on .theright hand side of the catch 4 are moved into coincidencewiththe corre,sponding tapered surfaces in the bolt 3. The coinciding movement of thetapered surfaces on the catch4 with those in the bolt forces the catchto move, downwardly away from the ward'of the key and at, the sametimeto rock the. catch bodily against the opposition of the spring 5 todisengage the nose 10 from the projectionllso that the bolt 3 may bemoved without any obstruction. into the opening position shown in Fig.6.

For the mounting of the lock on.the member 12, for example a door, thecenters of the, bores receivingthe casing sleeve 2 and the sleevel forguiding the keys are fixed by a thorn templet in such a manner, that,after the drilling of the bores and the subsequent. cementing of saidsleeves into said bores, the ward of the key 8 inserted into the sleeve1 may extend into the recess 9 of the bolt 3' (see Figs. 2, 4 and 6).Preferably, the sleeve 2, like the sleeve 1, is made of a plastic or thelike.

The center of the bore 16 arranged in the member 14, for example a wallof a-cabinet, may be readily fixed-by means of a small centering point13 arranged on the end surface of the bolt 3. Preferably, a small amountof paint or other marking material is applied to said centering point 13whereupon the bolt 3 is moved towards the member 14 for marking thecenter of the bore 16 by means of its point 13. After the drilling ofthe bore 16, the bolt receiving sleeve 6, preferably made of anartificial material such as a plastic, is cemented into the bore 16. Thebolt 3 enters the sleeve 6 when it is in its advanced locking positionshown in Fig. 4.

As will be readily understood from above, the loci: according to theinvention comprises only a few elements, i. e. the sleeves 1, 2 and 6,the bolt 3, the catch 4 and the spring 5. Preferably, the sleeves 1, 2and 6 are made of plastic material, so that they may be easily cementedinto the respective members 12 and 14. The bolt 3, likewise, may be madeof a plastic. The lock may be readily mounted in the members 12 and 14upon drilling of three bores, the centers of which can be easily fixed.The safeguarding means 7 corresponding to the shape of the ward of thekey 8 are arranged in the sleeve 1 for guiding the key, and the bolt 3has a recess 9 for receiving the catch 4. Thus, the bolt lock accordingto the invention has considerably less parts than hitherto customarybolt locks and may be easily mounted on members to be locked.

I have described a preferred embodiment of my invention, but it isunderstood that this disclosure is for the purpose of illustration andthat various omissions or changes in shape, proportion and arrangementof parts, as well as the substitution of equivalent elements for those,herein shown and described, may be made without departing from thespirit and scope of the invention as set forth in the appended claims.

What I claim is:

1. A bolt lock for mounting in one of two relatively movable members,comprising a first sleeve capable of receiving a warded key, said firstsleeve being arranged in a first bore of one of said members, a secondsleeve for arrangement ina second bore of said one member, thelongitudinal axes of the first and second sleeve being offset andextending in directions substantially perpendicular to each other, abolt slidably arranged in said second sleeve, said bolt having a recessfor engagement with the ward of the key, a longitudinal cavity definedin said bolt, a safety lever mounted in said cavity on a fulcrum forlocking movement, said safety lever having a catch adjacent one end andan inclined surface at the other end, the catch being positioned toengage a portion of said second sleeve when said bolt is in advancedlocking position, said bolt containing spring means urging said catchtoward said sleeve portion, the end of said cavity adjacent safety leverby the ward of said key when the key is turned to retract the bolt, theinclined surface of said safety lever then sliding along the inclinedwall of said cavity to permit rocking movement of said safety lever tobring the catch out of engagement with said sleeve portion.

2. In a bolt lock assembly, a bolt sleeve, a bolt slidably mounted insaid sleeve for engagement by a warded key to move said bolt between anadvanced, locking position and a retracted unlocking position, said bolthaving a longitudinal cavity therein, said sleeve having a dependingterminal projection extending into said cavity, a bowed leaf spring insaid cavity and a safety lever contained in said cavity and resting uponsaid leaf spring, the safety lever being mounted in said cavity forrocking movement about an axis intermediate its ends, said safety leverhaving a catch adjacent one end and positioned to engage With saidsleeve projection when said bolt is in advanced locking position toreleasably maintain said bolt in said advanced position, said leafspring urging said safety lever in a direction toward said sleeveprojection, the end of said safety lever opposite said catch beingpositioned to be engaged by the ward of said key when said key is turnedin a direction to retract the bolt, and to be moved by said key wherebysaid lever is rocked in a direction to bring the catch out of engagementwith said sleeve projection, and said cavity having an inclined end Wallsurface shaped to permit rearward sliding movement of the end of saidsafety lever opposite the catch in said cavity when said safety lever isengaged and moved by said key ward in retracting said bolt.

References Cited in the file of this patent UNITED STATES PATENTS236,660 Post Jan. 11, 1881 408,688 Burgess Aug. 13, 1889 506,792 NixholmOct. 17, 1893 1,125,791 Aston Jan. 19, 1915 1,261,181 Tamburini Apr. 2,1918 1,382,097 Larsen June 21, 1921 1,490,578 Bachmann Apr. 15, 19241,741,653 Palmer Dec. 31, 1929 2,499,165 Roethel Feb. 28, 1950 2,630,004Welshons Mar. 3, 1953 FOREIGN PATENTS 290,818 Great Britain May 24, 1928599,152 Great Britain Mar. 5, 1948 705,503 Germany Apr. 30, 1941

